Isthmus of the fauces

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Isthmus of the fauces
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A view of the isthmus of the fauces through the mouth cavity. The cheeks have been slit transversely and the tongue pulled forward. (Isthmus faucium labeled at center right.)
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Pharynx
Details
Identifiers
Latin Isthmus faucium
TA A05.2.01.002
FMA 55006
Anatomical terminology

The isthmus of the fauces or the oropharyngeal isthmus is a part of the oropharynx directly behind the mouth cavity, bounded superiorly by the soft palate, laterally by the palatoglossal arches, and inferiorly by the tongue.

Soft palate tissue constituting the back of the roof of the mouth

The soft palate is, in mammals, the soft tissue constituting the back of the roof of the mouth. The soft palate is part of the palate of the mouth; the other part is the hard palate. The soft palate is distinguished from the hard palate at the front of the mouth in that it does not contain bone.

Palatoglossal arch

The palatoglossal arch on either side runs downward, lateral, and forward to the side of the base of the tongue, and is formed by the projection of the glossopalatine muscle with its covering mucous membrane. It is the anterior border of isthmus faucium and marks the border between the mouth and the palatopharyngeal arch. The latter marks the beginning of the pharynx.

Tongue mouth organ that tastes and facilitates speech

The tongue is a muscular organ in the mouth of most vertebrates that manipulates food for mastication, and is used in the act of swallowing. It is of importance in the digestive system and is the primary organ of taste in the gustatory system. The tongue's upper surface (dorsum) is covered by taste buds housed in numerous lingual papillae. It is sensitive and kept moist by saliva, and is richly supplied with nerves and blood vessels. The tongue also serves as a natural means of cleaning the teeth. A major function of the tongue is the enabling of speech in humans and vocalization in other animals.

The fauces are regarded as the two pillars, formed by the palatoglossus and the palatopharyngeus muscle, respectively, and covered with mucous membrane. The anterior one is known as the palatoglossal arch, and the posterior one is known as the palatopharyngeal arch. Between these two arches is the palatine tonsil.

Palatoglossus muscle

The palatoglossus, glossopalatinus, or palatoglossal muscle is a small fleshy fasciculus, narrower in the middle than at either end, forming, with the mucous membrane covering its surface, the glossopalatine arch.

Palatopharyngeus muscle

The palatopharyngeusmuscle is a small muscle in the roof of the mouth.

Mucous membrane the protective layer, which lines the interior of hollow organs

A mucous membrane or mucosa is a membrane that lines various cavities in the body and covers the surface of internal organs. It consists of one or more layers of epithelial cells overlying a layer of loose connective tissue. It is mostly of endodermal origin and is continuous with the skin at various body openings such as the eyes, ears, inside the nose, inside the mouth, lip, vagina, the urethral opening and the anus. Some mucous membranes secrete mucus, a thick protective fluid. The function of the membrane is to stop pathogens and dirt from entering the body and to prevent bodily tissues from becoming dehydrated.

Each palatoglossal arch runs downwards, laterally and forwards, from the soft palate to the side of the tongue. The approximation of the arches due to the contraction of the palatoglossal muscles constricts the isthmus, and is essential to swallowing (deglutition).

Swallowing, sometimes called deglutition in scientific contexts, is the process in the human or animal body that allows for a substance to pass from the mouth, to the pharynx, and into the esophagus, while shutting the epiglottis. Swallowing is an important part of eating and drinking. If the process fails and the material goes through the trachea, then choking or pulmonary aspiration can occur. In the human body the automatic temporary closing of the epiglottis is controlled by the swallowing reflex.

Faucitis

Faucitis in a 12-year-old cat that presented with inappetence, tenderness of the mouth, and inability to groom itself. Gingivitis, erosive lingual ulcers and faucitis were evident clinically Faucitis01.jpg
Faucitis in a 12-year-old cat that presented with inappetence, tenderness of the mouth, and inability to groom itself. Gingivitis, erosive lingual ulcers and faucitis were evident clinically

Inflammation of the fauces, known as faucitis, is seen in animals. In cats, faucitis is usually a secondary disease to gingivitis but can be a primary disease. In this species faucitis is usually caused by bacterial and viral infections although food allergies need to be excluded in any diagnosis. Treatment is symptomatic and includes broad-spectrum antibiotics and in severe cases where cats are inappetant, corticosteroids (often given as depot forms, e.g. depomedrol) or chemotherapy (e.g. chlorambucil).

Gingivitis Human disease

Gingivitis is a non-destructive disease that causes inflammation of the gums. The most common form of gingivitis, and the most common form of periodontal disease overall, is in response to bacterial biofilms that is attached to tooth surfaces, termed plaque-induced gingivitis. Most forms of gingivitis are plaque-induced.

Food allergy hypersensitivity reaction type I disease that is an abnormal response to a food, triggered by the bodys immune system

A food allergy is an abnormal immune response to food. The symptoms of the allergic reaction may range from mild to severe. They may include itchiness, swelling of the tongue, vomiting, diarrhea, hives, trouble breathing, or low blood pressure. This typically occurs within minutes to several hours of exposure. When the symptoms are severe, it is known as anaphylaxis. A food intolerance and food poisoning are separate conditions, not due to an immune response.

Symptomatic treatment is any medical therapy of a disease that only affects its symptoms, not its cause, i.e., its etiology. It is usually aimed at reducing the signs and symptoms for the comfort and well-being of the patient, but it also may be useful in reducing organic consequences and sequelae of these signs and symptoms of the disease. In many diseases, even in those whose etiologies are known, symptomatic treatment is the only one available so far.

See also

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